U.S. patent number 11,097,580 [Application Number 16/230,776] was granted by the patent office on 2021-08-24 for methods and apparatus for a modular double pin load sensor coupled to a hitch receiver.
This patent grant is currently assigned to Ford Global Technologies, LLC, Methode Electronics, Inc.. The grantee listed for this patent is Ford Global Technologies, LLC. Invention is credited to Christopher Eric Allard, Kevin Stanton Giaier, Johannes Gie ibl, Peter Simeon Lazarevski, Andrew Niedert, Chad Reed.
United States Patent |
11,097,580 |
Niedert , et al. |
August 24, 2021 |
Methods and apparatus for a modular double pin load sensor coupled
to a hitch receiver
Abstract
Methods, apparatus, systems and articles of manufacture are
disclosed for a modular double pin load sensor coupled to a hitch
receiver. An example disclosed apparatus to be coupled to a
receiver tube includes a crossbar interface to be coupled to a
crossbar of a hitch, a pin adapter coupled to the crossbar
interface, a first load-sensing pin disposed within the pin
adapter, and a second load-sensing pin disposed within the pin
adapter.
Inventors: |
Niedert; Andrew (New Hudson,
MI), Allard; Christopher Eric (Canton, MI), Lazarevski;
Peter Simeon (Dearborn, MI), Giaier; Kevin Stanton
(Sylvan Lake, MI), Reed; Chad (Southfield, MI), Gie ibl;
Johannes (Amerang, DE) |
Applicant: |
Name |
City |
State |
Country |
Type |
Ford Global Technologies, LLC |
Dearborn |
MI |
US |
|
|
Assignee: |
Ford Global Technologies, LLC
(Dearborn, MI)
Methode Electronics, Inc. (Chicago, IL)
|
Family
ID: |
1000005757637 |
Appl.
No.: |
16/230,776 |
Filed: |
December 21, 2018 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20200198422 A1 |
Jun 25, 2020 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B60D
1/36 (20130101); B60D 1/01 (20130101); B60D
1/62 (20130101) |
Current International
Class: |
B60D
1/36 (20060101); B60D 1/62 (20060101); B60D
1/01 (20060101) |
Field of
Search: |
;280/446.1 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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104280165 |
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Jan 2015 |
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CN |
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102014217801 |
|
Mar 2016 |
|
DE |
|
102014217801 |
|
Mar 2016 |
|
DE |
|
2363307 |
|
Sep 2011 |
|
EP |
|
2018171937 |
|
Sep 2018 |
|
WO |
|
Other References
Wirthlin, "Intelligent Hitch for Measuring Both Trailer Weight and
Tongue Weight," Jun. 26, 2015, 5 pages. cited by applicant.
|
Primary Examiner: Seoh; Minnah L
Assistant Examiner: McGuire; Sophia Marie
Attorney, Agent or Firm: Coppiellie; Ray Hanley, Flight
& Zimmerman, LLC
Claims
What is claimed is:
1. An apparatus to be coupled to a receiver tube, apparatus
comprising: a crossbar interface to be coupled to a crossbar of a
hitch; a pin adapter coupled to the crossbar interface; a first
load-sensing pin disposed within the pin adapter, the pin adapter
shaped such that the pin adapter does not contact a horizontal
surface of the first load-sensing pin; and a second load-sensing
pin disposed within the pin adapter.
2. The apparatus as defined in claim 1, wherein the pin adapter is
to provide a first load path between the receiver tube and the
first load-sensing pin and a second load path between the receiver
tube and the second load-sensing pin.
3. The apparatus as defined in claim 1, wherein the first
load-sensing pin and the second load-sensing pin are at
substantially the same vertical position relative to the
crossbar.
4. The apparatus as defined in claim 1, further including a load
manager including: a component interface to receive load data from
at least one of the first load-sensing pin and the second
load-sensing pin; a hitch pin signal analyzer to determine a load
condition of the pin adapter based on the load data; and a display
interface to display the load condition.
5. The apparatus as defined in claim 4, wherein a configuration of
the first load-sensing pin and the second load-sensing pin causes
the load condition to be statically determinate.
6. The apparatus as defined in claim 1, wherein the first
load-sensing pin and the second load-sensing pin provide the only
load path between the receiver tube and the crossbar.
7. The apparatus of claim 1, wherein the first load-sensing pin is
to be disposed on an opposite side of the crossbar as the second
load-sensing pin.
8. An apparatus, comprising: a component interface to receive load
data from a first load-sensing pin and a second load-sensing pin,
the first load-sensing pin and the second load-sensing pin
operatively coupled to a receiver tube of a hitch of a vehicle, the
first load-sensing pin and the second load-sensing pin disposed
within a pin adapter, the pin adapter shaped such that the pin
adapter does not contact a horizontal surface of the first
load-sensing pin; a hitch pin signal analyzer to determine a load
condition of the hitch based on the load data; a display alert
generator to, when the load condition satisfies an alert threshold,
generate an alert; and a display interface to display at least one
of the load condition or the alert to a user.
9. The apparatus as defined in claim 8, wherein the pin adapter
provides a load path between the first and second load-sensing pins
and the vehicle.
10. The apparatus as defined in claim 8, wherein the hitch pin
signal analyzer is to: determine a vertical load condition of the
hitch based on data from the first load-sensing pin and the second
load-sensing pin; and determine a horizontal load condition of the
hitch based on data from the second load-sensing pin.
11. The apparatus as defined in claim 9, wherein the hitch pin
signal analyzer determines the load condition based on a
configuration of the first load-sensing pin and the second
load-sensing pin, the configuration causing the load condition to
be statically determinate.
12. The apparatus as defined in claim 11, wherein the configuration
includes the first load-sensing pin and the second load-sensing pin
at substantially the same vertical position relative to the
receiver tube.
13. The apparatus as defined in claim 8, wherein the alert
threshold corresponds to an improper load condition.
14. The apparatus of claim 8, wherein the receiver tube is
configured to receive a trailer hitch arm along an axis, the first
load-sensing pin and the second load-sensing pin disposed above the
axis.
15. A method, comprising: receiving load data from a first
load-sensing pin and a second load-sensing pin, the first
load-sensing pin and the second load-sensing pin are operatively
coupled to a receiver tube of a hitch of a vehicle, the first
load-sensing pin and the second load-sensing pin coupled to a pin
adapter that is the only load path between the first and second
load-sensing pins and the receiver tube; determining a load
condition of the hitch based on the load data; when the load
condition satisfies an alert threshold, generating an alert; and
presenting at least one of the load condition or the alert to a
user.
16. The method as defined in claim 15, wherein the pin adapter is
shaped such that the pin adapter does not contact a horizontal
surface of the first load-sensing pin.
17. The method as defined in claim 15, further including:
determining a vertical load condition of the hitch based on data
from the first load-sensing pin and the second load-sensing pin;
and determining a horizontal load condition of the hitch based on
data from the second load-sensing pin.
18. The method as defined in claim 15, wherein the determination of
the load condition is based on a configuration of the first
load-sensing pin and the second load-sensing pin, the configuration
causing the load condition to be statically determinate.
19. The method as defined in claim 18, wherein the configuration
includes the first load-sensing pin and the second load-sensing pin
at substantially the same vertical position relative to the
receiver tube.
20. The method of claim 15, wherein the pin adapter is disposed on
a top surface of the receiver tube.
Description
FIELD OF THE DISCLOSURE
This disclosure relates generally to vehicle hitches and, more
particularly, to methods and apparatus for a modular double pin
load sensor coupled to a hitch receiver.
BACKGROUND
In recent years, consumer vehicles capable of pulling trailers have
implemented additional data processing capabilities. With these
capabilities, vehicles can process parameters of a vehicle and/or
trailer not previously processed to provide additional insights to
a user of the vehicle. For example, an additional parameter of the
vehicle that can be processed is the load condition experienced at
a hitch. The load condition includes various characteristics (e.g.,
weight, load orientation, braking force, etc.) experienced by the
hitch.
Different vehicle models often have different configurations,
including spare tire placement, fuel tank placement, floor board
height, frame rail spacing, etc. As a result, the hitch design may
vary significantly between model types. Regardless of the specific
model of a vehicle, vehicle hitches generally include a receiver
tube and a crossbar. The receiver tube of a hitch is used to couple
a towing element (e.g., a hitch ball, a drawbar, etc.) to the
vehicle and often has a square cross-section. A crossbar is a tube
connecting the driver and passenger sides of a vehicle to the
receiver tube. Crossbars often have simple geometric
cross-sections, such as a circle or a square.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an example vehicle including a hitch pin load
manager and a pin adapter including load-sensing pins by which the
examples disclosed herein may be implemented.
FIG. 2A illustrates the load-sensing pins of FIG. 1.
FIG. 2B illustrates the load-sensing pins of FIG. 2A disposed
within a pin adapter.
FIG. 2C illustrates the pin adapter of FIG. 2B coupled to the
receiver tube of FIG. 1.
FIG. 3 illustrates an isometric view of the load-sensing pin
housing of FIG. 1.
FIG. 4 illustrates an isometric view of the load-sensing pin
housing of FIG. 3 coupled to the crossbar of FIG. 1.
FIG. 5 illustrates an isometric view of an alternative example of a
load-sensing pin housing by which the examples disclosed herein may
be implemented.
FIG. 6 illustrates an isometric view of the load-sensing pin
housing of FIG. 5 coupled to a crossbar.
FIGS. 7A-7B illustrate an example loading condition on a hitch ball
associated with a trailer and the corresponding load-sensing pins
of FIGS. 2A-2C.
FIG. 8 is a block diagram detailing the hitch pin load manager of
FIG. 1.
FIG. 9 is a flowchart representative of machine readable
instructions that may be executed to implement the hitch pin load
manager of FIG. 1.
FIG. 10 is a block diagram of an example processing platform
structured to execute the instructions of FIG. 9 to implement the
load manager of FIG. 8.
The figures are not to scale. Instead, the thickness of the layers
or regions may be enlarged in the drawings. In general, the same
reference numbers will be used throughout the drawing(s) and
accompanying written description to refer to the same or like
parts.
DETAILED DESCRIPTION
Many vehicle hitch designs are specific to individual vehicle
models and, thus, can require the hitch to have unique shapes and
parts specific to each vehicle model. Variations in hitch design
between vehicle models can be attributed to the shape of the rear
bumper housing, packaging requirements for the spare tire, floor
board height, frame rail spacing, etc. These variations in hitch
design can make it difficult to package force-sensing elements
(e.g., pins, strain gauge, etc.) into a hitch. For example, each
hitch design can require specifically designed force-sensing
elements, which can increase manufacturing cost and reduce
availability of replacement parts.
In some examples disclosed herein, load-sensing pins are used to
determine the load condition of a trailer on a vehicle. Other
load-sensing elements such as pressure sensors, piezoelectric
sensors, etc. are specifically tailored to the hitch (e.g., the
hitch ball diameter, etc.) or the interaction between the vehicle
and the trailer (e.g., ride height differences between the vehicle
and trailer, etc.). Because hitch ball and/or drawbar diameter
varies with the coupled trailer, use of pressure sensors and
piezoelectric sensors may not be practical. Accordingly, the
examples disclosed herein include load-sensing pins that can be
implemented on any vehicle and trailer configuration.
Examples disclosed herein address the above-noted problems by
determining one or more load characteristics at the trailer hitch
receiver with two load-sensing pins disposed within a pin adapter
coupled to a receiver tube. In some examples disclosed herein, the
housing is coupled to a crossbar via a housing. In some examples
disclosed herein, the pin adapter is shaped such that the pin
adapter does not contact a horizontal surface of the first
load-sensing pin. In some examples disclosed herein, the first
load-sensing pin and the second load-sensing pin are at
substantially the same vertical position relative to the crossbar.
In some examples disclosed herein, a load manager analyzes the
outputs of the first load-sensing pin and the second load-sensing
pin and presents a load condition to a user.
In some examples disclosed herein, the housing, the crossbar and/or
load manager can include various configurations that may depend on
a type of vehicle model and/or trailer coupled to the vehicle. In
some examples disclosed herein, the configurations of the housing,
the crossbar and/or load manager can be altered to minimize the
packaging space of the load-sensing pins.
FIG. 1 illustrates an example vehicle 100 including an example load
manager 102 and an example hitch 101. The example hitch 101
includes an example housing 104 that includes an example first
load-sensing pin 105A and an example second load-sensing pin 105B
by which the examples disclosed herein may be implemented. In the
illustrated example of FIG. 1, the housing 104 is coupled to an
example receiver tube 106, an example crossbar 108 and an example
chain bracket 110. In the illustrated example of FIG. 1, the
crossbar 108 is coupled to the example vehicle 100 via an example
first hitch mounting plate 112A and an example second hitch
mounting plate 112B. The load manager 102 is communicatively
coupled to at least one of an example display 114 and an example
camera 116.
In the illustrated example of FIG. 1, the vehicle 100 can tow a
trailer coupled to the vehicle 100 via the example hitch 101. For
example, a tow ball can be coupled to the hitch 101 via the example
receiver tube 106. The coupled tow ball enables a trailer to be
pivotally coupled to the hitch 101. In the illustrated example, the
vehicle 100 is a consumer automobile. In other examples, the
vehicle 100 can be a commercial truck, a motorcycle, a motorized
cart, an all-terrain vehicle, a motorized scooter, a locomotive, or
any other vehicle.
The load manager 102 receives load information (e.g., forces,
torques, etc.) from the first load-sensing pin 105A and the second
load-sensing pin 105B. In some examples, the load manager 102 can
analyze the received load information to determine a load condition
of the vehicle 100 and/or the hitch 101. For example, the load
manager 102 can determine a vertical load condition (e.g., a load
condition in a direction orthogonal to the ground), a horizontal
load condition (e.g., a load condition in a direction parallel to
the receiver tube 106, etc.) and/or a lateral load condition (e.g.,
a load condition in a direction parallel to the crossbar 108,
etc.). In some examples, if the load condition satisfies an alert
threshold, the load manager 102 can generate an alert to indicate
to a user of the vehicle 100 that the vehicle 100 is improperly
loaded.
In the illustrated example of FIG. 1, the example housing 104 is
C-channel shaped to enable the housing 104 to be coupled to the
example crossbar 108. In other examples, the housing 104 can have
any other suitable shape. In the illustrated example, the housing
104 is coupled to the crossbar 108 via fasteners (e.g., bolts,
screws, etc.). In other examples, any other suitable means of
coupling the housing 104 to the crossbar 108 can be used (e.g., a
weld, a press fit, etc.). In the illustrated example, the example
housing 104 is coupled to the example receiver tube 106 via a weld,
a press fit, one or more fasteners and/or any other suitable
means.
The example load-sensing pins 105A, 105B are disposed within the
example housing 104. In some examples, the load-sensing pins 105A,
105B are at substantially the same vertical position relative to
the example crossbar 108. The example load-sensing pins 105A, 105B
are described below in conjunction with FIG. 2A.
The example crossbar 108 is a structural element that connects the
example housing 104 to the vehicle 100. In the illustrated example,
the crossbar 108 has a quadrilateral cross-section. In other
examples, the example crossbar 108 can have any other suitable
cross-section (e.g., polygonal, circular, ovoid, etc.). In the
illustrated example, the crossbar 108 is two tubes bisected by the
housing 104. In other examples, the example crossbar 108 can be a
single continuous tube. An example hitch that may be coupled to a
single continuous crossbar is described below in conjunction with
FIGS. 5 and 6.
The example chain bracket 110 acts as redundant attachment point
between the hitch 101 and a trailer. For example, one or more
chains or similar mechanical elements can be coupled to the hitch
101 and the chain bracket 110. In operation, if the primary
coupling between the trailer and the hitch 101 fails (e.g., the
coupling via the receiver tube 106, etc.), the chain(s) prevent the
trailer from becoming detached from the hitch 101.
The example first hitch mounting plate 112A and the example second
hitch mounting plate 112B can be used to couple the hitch 101 to
the vehicle 100. For example, the hitch mounting plates 112A, 112B
can be coupled to the frame of the vehicle 100 via one or more
fasteners. In other examples, the hitch mounting plates 112A, 112B
can be coupled to the vehicle 100 via any other suitable means
(e.g., a weld, etc.).
The example load manager 102 can be communicatively coupled to the
example display 114. In some examples, the display 114 can be
within an interior of the vehicle 100 (e.g., a dashboard display,
an overhead display, etc.). Additionally or alternatively, the
display 114 can be included in a mobile device (e.g., a smartphone,
a tablet, a smartwatch, etc.) of an operator or a passenger of the
vehicle 100. In some examples, the display 114 can display the load
condition determined by the load manager 102. In some examples, the
display 114 can present an alert to a user of the vehicle 100 when
a load condition satisfies an alert threshold.
In the illustrated example, the example load manager 102 is
additionally coupled to the camera 116. In some examples, the
camera 116 is mounted on an exterior surface of the vehicle 100
(e.g., the camera 116 is a backup assistance camera, etc.). In some
examples, an output of the example camera 116 can be used to
determine the orientation of a trailer coupled to the hitch
101.
FIG. 2A illustrates the load-sensing pins 105A, 105B of FIG. 1. In
the illustrated example of FIG. 2A, the example load-sensing pins
105A, 105B have a circular cross-section. In other examples, the
load-sensing pins 105A, 105B can have any other suitable
cross-sectional shape. In some examples, the first load-sensing pin
105A and/or the second load-sensing pin 105B can have a hollow
cross-section. In other examples, the load-sensing pins 105A, 105B
can have any other suitable cross-section (e.g., solid, etc.). In
some examples, the diameter of the load-sensing pins 105A, 105B can
be changed depending on the load rating of the hitch 101. For
example, if the hitch 101 is designed to tow a relatively heavy
load, the example load-sensing pins 105A, 105B can have an
appropriate larger diameter. In some examples, to enable modularity
of the hitch 101, the diameters and/or lengths of the load-sensing
pins 105A, 105B can be incremented and selected based on tow
capacity of the hitch 101 (e.g., a hitch with a larger tow capacity
may use load-sensing pins with a large diameter, etc.). In the
illustrated example, the first load-sensing pin 105A and the second
load-sensing pin 105B have the same shape and diameter. In some
examples, the first load-sensing pin 105A and the second
load-sensing pin 105B are a ferrous material (e.g., high strength
steel, etc.). In other examples, the load-sensing pin 105A and the
second load-sensing pin 105B can be any other suitable material. In
some examples, the first load-sensing pin 105A and the second
load-sensing pin 105B can have different diameters, lengths,
cross-sections and/or load ratings.
FIG. 2B illustrates the load-sensing pins 105A, 105B of FIG. 2A
disposed within an example pin adapter 202. In the illustrated
example, the example pin adapter 202 has an example first opening
204A and an example second opening 204B. In the illustrated
example, the pin adapter 202 has a rectangular cross-section with
top-filleted corners. In other examples, the pin adapter 202 can
have any suitable cross-section (e.g., rectangular with chamfered
corners, etc.). The example pin adapter 202 can be composed of
metal or any combination of metals (e.g., steel, aluminum, etc.),
composites (e.g., carbon fiber, etc.), plastics and/or any other
suitable materials.
The example first load-sensing pin 105A and the example second
load-sensing pin 105B are inserted into the pin adapter 202 via the
example first opening 204A and the example second opening 204B,
respectively. In the illustrated example, the openings 204A, 204B
are shaped to allow the insertion of the load-sensing pins 105A,
105B. The example openings 204A, 204B can be shaped in a manner to
prevent one or both of the load-sensing pins 105A, 105B from
bearing load in a particular direction. For example, the first
opening 204A may be shaped (e.g., ovoid, elliptical, etc.) to
prevent the first load-sensing pin 105A from bearing a load in the
horizontal direction (e.g., parallel to the receiver tube 106 of
FIG. 1, etc.). In some examples, the first opening 204A can have
small flat sections (e.g., 5 millimeters, etc.) on the top and
bottom of the pin adapter 202. In such examples, the contact
interface between the first load-sensing pin 105A and the pin
adapter is a line contact. In some examples, the load-sensing pins
105A, 105B can be coupled to the pin adapter 202 via a press-fit
within the openings 204A, 204B. In this example, this coupling can
cause the load-sensing pins 105A, 105B to have a preload strain. In
other examples, the load-sensing pins 105A, 105B may be coupled to
the pin adapter 202 and/or openings 204A, 204B via any other
suitable means (e.g., spline teeth, etc.).
FIG. 2C illustrates the example pin adapter 202 of FIG. 2B coupled
to the receiver tube 106 of FIG. 1. In the illustrated example, the
pin adapter 202 is coupled to a top surface 206 of the receiver
tube 106. In some examples, the pin adapter 202 provides a first
load path between the receiver tube 106 and the first load-sensing
pin 105A and a second load path between the receiver tube 106 the
second load-sensing pin 105B. In the illustrated example, coupling
the pin adapter 202 to the receiver tube 106 causes the first
load-sensing pin 105A and the second load-sensing pin 105B to be at
substantially the same vertical position relative to the receiver
tube 106. In some examples, the pin adapter 202 is welded to the
receiver tube 106. In other examples, the pin adapter 202 can be
coupled to the receiver tube 106 via any other suitable means or
combination of means (e.g., a press fit, a fastener, etc.). In some
examples, the receiver tube 106 can be integral with the pin
adapter 202.
FIG. 3 illustrates an isometric view of the load-sensing pin
housing 104 of FIG. 1. The housing 104 includes an example pin
adapter housing 302, the first load-sensing pin 105A, the second
load-sensing pin 105B, the pin adapter 202, an example first
crossbar interface 304A and an example second crossbar interface
304B. In the illustrated example, the first crossbar interface 304A
includes an example first fastener aperture 306A and the example
second crossbar interface 304B includes an example second fastener
aperture 306B. In the illustrated example, the pin adapter housing
302 includes an example first aperture 308A, an example second
aperture 308B, an example third aperture 308C, and an example
fourth aperture 308D.
In the illustrated example, the example pin adapter housing 302 is
C-channel shaped. Alternatively, the pin adapter housing 302 can be
any other suitable shape to allow the pin adapter housing 302 to be
coupled to the pin adapter 302. The first aperture 308A is aligned
with the third aperture 308C. Similarly, the second aperture 308B
is aligned with the fourth aperture 308D. In the illustrated
example, the pin adapter housing 302 is coupled to the pin adapter
202 via the load-sensing pins 105A, 105B. For example, the first
load-sensing pin 105A can be inserted into the first aperture 308A,
through the pin adapter 202 (e.g., via the opening 204A of FIG. 2B)
and further through the third aperture 308C. Similarly, the second
load-sensing pin 105B can be inserted through the second aperture
308B, through the pin adapter 202 (e.g., via the opening 204B of
FIG. 2B) and further through the third aperture 308C. Additionally
or alternatively, the pin adapter housing 302 can be coupled to pin
adapter 302 via any other means (e.g., press fit, etc.).
The example first crossbar interface 304A and the example second
crossbar interface 304B enables the housing 104 to be coupled to a
crossbar (e.g., the example crossbar 108 of FIG. 1, etc.). In some
examples, the shape of the crossbar interfaces 304A, 304B
corresponds to the shape of the crossbar 108 (e.g., the crossbar
interfaces 304A, 304B have circular cross-sections, etc.). In the
illustrated example, the cross-section of the first crossbar
interface 304A corresponds to the cross-section of the crossbar
108, which enables the example first crossbar interface 304A to be
inserted into the crossbar 108. Similarly, the cross-section of the
example second crossbar interface 304B corresponds to the example
crossbar 108. In some examples, the housing 104 can be further
coupled to the crossbar 108 via one or more bolts coupled to the
housing 104 and crossbar 108 via the example fastener apertures
306A, 306B.
FIG. 4 illustrates an isometric view of the load-sensing pin
housing 104 of FIG. 3 coupled to the crossbar 108 of FIG. 1. The
load-sensing pin housing 104 is further coupled to the chain
bracket 110 of FIG. 4. The load-sensing pin housing 104 is coupled
to the crossbar 108 and the chain bracket 110 via an example first
fastener 402A and an example second fastener 402B. In the
illustrated example, the fasteners 402A, 402B are bolts. In other
examples, the fasteners 402A, 402B can be any other suitable type
of fastener (e.g., screws, rivets, etc.). In some examples, the
chain bracket can be welded directly to the example housing 104. In
some examples, the load-sensing pins 105A, 105B act as the only
load path between the receiver tube 106 and the crossbar 108. For
example, the first load-sensing pin 105A acts a first load path
between the receiver tube
FIG. 5 illustrates an isometric view of an alternative example
load-sensing pin-housing assembly 500 by which the examples
disclosed herein may be implemented. In the illustrated example,
the pin-housing assembly 500 includes an example pin housing 501.
The pin housing 501 includes an example channel 502 to enable the
coupling of a continuous crossbar (e.g., as opposed to the
segmented crossbar 108 of FIG. 1) to be coupled the pin-housing
assembly 500. The pin-housing assembly 500 further includes an
example first pin adapter 504A and an example second pin adapter
504B. In the illustrated example, a continuous crossbar may be
coupled to the pin-housing via a first bolt via an example first
aperture 506A and an example second aperture 506B and a second bolt
via an example third aperture 506C and an example fourth aperture
506D.
In the illustrated example of FIG. 5, the first pin adapter 504A is
disposed on a rear-side (e.g., a trailer side, etc.) of the channel
502 and the second pin adapter 504B is disposed on a front side
(e.g., a vehicle side, etc.) of the channel 502. In the illustrated
example, the first loading-sensing pin 105A is coupled to the first
pin adapter 504A and the second load-sensing pin 105B is coupled to
the second pin adapter 504B. In the illustrated example, the first
pin adapter 504A and the second pin adapter 504B are each coupled
to the receiver tube 106 via a weld, fastener and/or any other
suitable means. In some examples, the first pin adapter 504A and
the second pin adapter 504B are provided in a unitary part. In the
illustrated example, the load-sensing pins 105A, 105B are at
substantially the same vertical position relative to the receiver
tube 106.
FIG. 6 illustrates an isometric view of the load-sensing pin
housing 501 of FIG. 5 coupled to an example crossbar 602. In the
illustrated example, the crossbar 602 is disposed within the
channel 502 and coupled to pin housing 501 via an example first
fastener 604A and an example second fastener 604B. In the
illustrated examples, the fasteners 604A, 604B are bolts. In other
examples, the fasteners 604A, 604B can be any other suitable type
of fastener (e.g., screws, rivets, etc.). In some examples, the
load-sensing pins 105A, 105B act as the only load path between the
receiver tube 106 and the crossbar 602.
FIG. 7A illustrates a side view of an example loading condition 700
on the example hitch 101 of FIG. 1 associated with a trailer and
the corresponding reaction force sensing pins of FIGS. 2A-2C. In
the illustrated example of FIG. 7A, the load condition 700 is based
on a load applied to an example hitch ball 702, where the load is
transmitted to a crossbar via the load-sensing pins 105A, 105B. In
the illustrated example, the load condition 700 is based on an
example applied vertical load 704, an example applied horizontal
load 705, an example first vertical reactionary load 706, an
example second vertical reactionary load 708, and an example first
horizontal reactionary load 710.
In the illustrated example, the second load-sensing pin 105B
carries the example second vertical reactionary load 708 and the
example first horizontal reactionary load 710. In the illustrated
example, the first load-sensing pin 105A carries the example first
vertical reactionary load 706. In some examples, the first
load-sensing pin 105A does not carry a horizontal reactionary load
because the example first opening 204A of FIG. 2 is shaped to
prevent the first load-sensing pin 105A from carrying a horizontal
load. In the illustrated example, the example first opening 204A is
ovoid (e.g., elongated in the horizontal direction, etc.) which
prevents a horizontal contact between first load-sensing pin 105A
and the pin adapter 202. In some examples, the first opening 204A
is shaped in a manner to prevent horizontal contact in any loading
scenario (e.g., the deflection caused by the coupled trailer,
etc.).
In some examples, the first vertical reactionary load 706, the
second vertical reactionary load 708, and the first horizontal
reactionary load 710 are measured by the example load-sensing pins
105A, 105B. In some examples, the load manager 102 can determine
the applied vertical load 704 and the applied horizontal load 705
based on the first vertical reactionary load 706, the second
vertical reactionary load 708, and the first horizontal reactionary
load 710. In some examples, the load manager 102 can use static
equilibrium analysis (e.g., torque balancing, force balancing,
etc.) to determine a magnitude of the applied loads 704, 705. For
example, the applied vertical load 704 can be calculated using
equation (1): .SIGMA.F.sub.z=-F.sub.tz+F.sub.p1-F.sub.p2=0 (1)
where .SIGMA.F.sub.z is the sum of the forces in the vertical
direction, F.sub.tz is the applied vertical load 704, F.sub.z1 is
the first vertical reactionary load 706, and F.sub.p2 is the second
vertical reactionary load 708. In this example, the applied
vertical load 704 is equal to the difference between the first
vertical reactionary load 706 and the second vertical reactionary
load 708. Similarly, the first applied horizontal load 705 can be
determined using equation (2): .SIGMA.F.sub.x=-F.sub.tx+F.sub.px=0
(2) where .SIGMA.F.sub.x is the sum of the forces in the horizontal
direction, F.sub.tx is the first applied horizontal load 705 and
F.sub.px is the first horizontal reactionary load 710. In this
example, the first applied horizontal load 705 is equal and
opposite to the first horizontal reactionary load 710.
FIG. 7B illustrates an example top view of the example loading
condition 700 on the example hitch 101 of FIG. 1 associated with a
trailer and the corresponding reaction force sensing pins of FIGS.
2A-2C. In the illustrated example of FIG. 7B, the load condition
700 is further based on a lateral applied load 712 applied to the
example hitch ball 702 and an example lateral reactionary load 714.
In the illustrated example, the moment generated by the lateral
applied load 712 further causes an example second horizontal
reactionary load 716 and an example third horizontal reactionary
load 718. In the illustrated example, an example first length 720
is the horizontal distance between the applied lateral load 712 and
the lateral reactionary load 714. In the illustrated example, an
example second length 722 is the lateral distance between the
applied lateral load 712 and the example second horizontal
reactionary load 716, and the lateral distance between the applied
lateral load 712 and the second horizontal reactionary load
716.
In the illustrated example, the second load-sensing pin 105B
carries the example second horizontal reactionary load 716 and the
example third horizontal reactionary load 718. In the illustrated
example, the first load-sensing pin 105A does not carry a
horizontal reactionary load because the example first opening 204A
of FIG. 2 is shaped to prevent the first load-sensing pin 105A from
bearing a horizontal load. In some examples, the lateral
reactionary load 714 is measured by the example load-sensing pin
105B. In some examples, the load manager 102 can determine the
applied lateral load 712 based on the lateral reactionary load 714.
For example, the applied lateral load 712 can be calculated using
equation (3): .SIGMA.F.sub.y=F.sub.ty=-F.sub.R1=0 (3) where
.SIGMA.F.sub.y is the sum of the forces in the lateral direction,
F.sub.ty is the applied lateral load 712 and F.sub.R1 is the
lateral reactionary load 714. In this example, the applied lateral
load 712 is equal and opposite to the lateral reactionary load
714.
In some examples, the lateral reactionary load 714 is not measured
by the load-sensing pin 105B (e.g., the reactionary load is carried
by a retainer clip, the load-sensing pin 105B cannot measure
lateral forces, etc.). In such examples, the applied lateral load
712 cannot be calculated using equation (3). Accordingly, the
applied lateral load 712 can be calculated using moment balancing
about the center of the second load-sensing pin 105B:
0=L.sub.2F.sub.R2+L.sub.2F.sub.R3-L.sub.1F.sub.ty (4) where
F.sub.ty is the applied lateral load 712, F.sub.R2 is the second
horizontal reactionary load 716, F.sub.R3 is the third horizontal
reactionary load 718, L.sub.1 is the first length 720 and L.sub.2
is the second length 722. Equation (4) can be solved for
F.sub.ty:
.times..times..times..times. ##EQU00001##
In some examples, the shape of the example opening 204A makes the
load condition of the hitch 101 statically determinate, which
allows the load condition to be determined without determining the
geometry of the tow ball 702. Additionally or alternatively, the
load manager 102 can incorporate rear view camera data to assist in
determining the applied loads 704, 705, 712. For example, the load
manager 102 can determine the moment arm (e.g., the position of the
tow ball, etc.) associated with the applied loads 704, 705, 712. In
some examples, an operator of the vehicle 100 can manually input
the geometry of the tow ball 702 into the load manager 102.
FIG. 8 is a block diagram detailing the example load manager 102 of
FIG. 1. The example load manager 102 includes an example component
interface 802, an example hitch pin signal analyzer 804, an example
rear view camera data integrator 806, an example display alert
generator 808 and an example display interface 810.
The example component interface 802 receives data from the
load-sensing pins 105A, 105B, camera 116 and/or any other
components of the vehicle 100 and/or hitch 101. In some examples,
the component interface 802 facilitates communication of the hitch
pin signal analyzer 804, the rear view camera data integrator 806,
the display alert generator 808 and the display interface 810. In
some example, the component interface 802 can convert the received
data from the components into a numerical form (e.g., human
readable, etc.). For example, if the load-sensing pins 105A, 105B
output an analog signal (e.g., an analog voltage, an analog
current, etc.) the component interface 802 can convert the received
data into values corresponding to the first vertical reactionary
load 706, the second vertical reactionary load 708, the first
horizontal reactionary load 710, and/or the lateral reactionary
load 714.
The example hitch pin signal analyzer 804 analyzes the received
load signals from the component interface 802 to determine the
vertical load condition of the vehicle 100 (e.g., corresponding to
the applied vertical load 704 of FIG. 7A, etc.), the horizontal
load condition of the vehicle 100 (e.g., corresponding to the
applied horizontal load 705 of FIG. 7A, etc.) and/or the lateral
load condition of the vehicle 100 (e.g., corresponding to the
applied lateral load 712, etc.). For example, the hitch pin signal
analyzer 804 can use static equilibrium analysis (e.g., force
balancing, moment balancing, etc.) to determine the applied
vertical load 704, the applied horizontal load 705 and/or the
applied lateral load 712. For example, the hitch pin signal
analyzer 804 can use equations (1), (2), (3) and/or (5) to
determine the applied loads 704, 705, 712. In some examples, the
hitch pin signal analyzer 804 can determine if at least one of the
vertical load condition, the horizontal load condition or the
lateral load condition satisfies an alert threshold. In some
examples, the alert threshold corresponds to an improper (e.g.,
misload, unbalanced, etc.) load condition.
The example rear view camera data integrator 806 retrieves image
data from the camera 116 of FIG. 1. In some examples, the image
data is processed by the camera data integrator 806 to determine a
position of a trailer coupled to the vehicle 100. In some examples,
the camera data integrator 806 can use this data to determine a
moment or torque applied to the hitch 101. For example, the camera
data integrator 806 can determine a displacement of a lateral
displacement of the trailer that can be used to determine a moment
applied to the hitch 101.
The example display alert generator 808 generates a notification to
be presented to a user of the vehicle 100. For example, the display
alert generator 808 can generate an alert if the hitch pin signal
analyzer 804 determines that an alert threshold is satisfied. In
some examples, the display alert generator 808 can generate a
visual alert to be presented to the user via the display 114.
Additionally or alternatively, the display alert generator 808 can
generate an auditory alert to be presented to the user (e.g., the
alert may be presented over speakers of the vehicle 100, a mobile
device of the user, etc.). In some examples, the display alert
generator 808 can generate instructions indicating to the user how
to correct the load condition.
The example display interface 810 communicates with the display 114
to present the horizontal load condition, the vertical load
condition and/or an alert generated by the display alert generator
808. In some examples, the display interface 810 can cause the
display 114 to present graphics, sounds and/or warnings to a user
of the vehicle 100 illustrating the horizontal load condition, the
vertical load condition and/or an alert.
While an example manner of implementing the load manager 102 of
FIG. 1 is illustrated in FIG. 8, one or more of the elements,
processes and/or devices illustrated in FIG. 4 may be combined,
divided, re-arranged, omitted, eliminated and/or implemented in any
other way. Further, the example component interface 802, the
example hitch pin signal analyzer 804, the example rear view camera
data integrator 806, the example display alert generator 808, the
example display alert generator display interface 810 and/or, more
generally, the example load manager 102 of FIG. 8 may be
implemented by hardware, software, firmware and/or any combination
of hardware, software and/or firmware. Thus, for example, any of
the example component interface 802, the example hitch pin signal
analyzer 804, the example rear view camera data integrator 806, the
example display alert generator 808, the example display alert
generator display interface 810 and/or, more generally, the example
load manager 102 could be implemented by one or more analog or
digital circuit(s), logic circuits, programmable processor(s),
programmable controller(s), graphics processing unit(s) (GPU(s)),
digital signal processor(s) (DSP(s)), application specific
integrated circuit(s) (ASIC(s)), programmable logic device(s)
(PLD(s)) and/or field programmable logic device(s) (FPLD(s)). When
reading any of the apparatus or system claims of this patent to
cover a purely software and/or firmware implementation, at least
one of the example component interface 802, the example hitch pin
signal analyzer 804, the example rear view camera data integrator
806, the example display alert generator 808, the example display
alert generator display interface 810 is/are hereby expressly
defined to include a non-transitory computer readable storage
device or storage disk such as a memory, a digital versatile disk
(DVD), a compact disk (CD), a Blu-ray disk, etc. including the
software and/or firmware. Further still, the example load manager
102 of FIG. 1 may include one or more elements, processes and/or
devices in addition to, or instead of, those illustrated in FIG. 8,
and/or may include more than one of any or all of the illustrated
elements, processes and devices. As used herein, the phrase "in
communication," including variations thereof, encompasses direct
communication and/or indirect communication through one or more
intermediary components, and does not require direct physical
(e.g., wired) communication and/or constant communication, but
rather additionally includes selective communication at periodic
intervals, scheduled intervals, aperiodic intervals, and/or
one-time events.
A flowchart representative of example methods, hardware implemented
state machines, and/or any combination thereof for implementing the
load manager 102 of FIG. 8 is shown in FIG. 9. The method may be an
executable program or portion of an executable program for
execution by a computer processor such as the processor 1012 shown
in the example processor platform 1000 discussed below in
connection with FIG. 10. The program may be embodied in software
stored on a non-transitory computer readable storage medium such as
a CD-ROM, a floppy disk, a hard drive, a DVD, a Blu-ray disk, or a
memory associated with the processor 1012, but the entire program
and/or parts thereof could alternatively be executed by a device
other than the processor 1012 and/or embodied in firmware or
dedicated hardware. Further, although the example program is
described with reference to the flowchart illustrated in FIG. 9,
many other methods of implementing the example load manager 102 may
alternatively be used. For example, the order of execution of the
blocks may be changed, and/or some of the blocks described may be
changed, eliminated, or combined. Additionally or alternatively,
any or all of the blocks may be implemented by one or more hardware
circuits (e.g., discrete and/or integrated analog and/or digital
circuitry, an FPGA, an ASIC, a comparator, an operational-amplifier
(op-amp), a logic circuit, etc.) structured to perform the
corresponding operation without executing software or firmware.
As mentioned above, the example method 900 of FIG. 9 may be
implemented using executable instructions (e.g., computer and/or
machine readable instructions) stored on a non-transitory computer
and/or machine readable medium such as a hard disk drive, a flash
memory, a read-only memory, a compact disk, a digital versatile
disk, a cache, a random-access memory and/or any other storage
device or storage disk in which information is stored for any
duration (e.g., for extended time periods, permanently, for brief
instances, for temporarily buffering, and/or for caching of the
information). As used herein, the term non-transitory computer
readable medium is expressly defined to include any type of
computer readable storage device and/or storage disk and to exclude
propagating signals and to exclude transmission media.
"Including" and "comprising" (and all forms and tenses thereof) are
used herein to be open ended terms. Thus, whenever a claim employs
any form of "include" or "comprise" (e.g., comprises, includes,
comprising, including, having, etc.) as a preamble or within a
claim recitation of any kind, it is to be understood that
additional elements, terms, etc. may be present without falling
outside the scope of the corresponding claim or recitation. As used
herein, when the phrase "at least" is used as the transition term
in, for example, a preamble of a claim, it is open-ended in the
same manner as the term "comprising" and "including" are open
ended. The term "and/or" when used, for example, in a form such as
A, B, and/or C refers to any combination or subset of A, B, C such
as (1) A alone, (2) B alone, (3) C alone, (4) A with B, (5) A with
C, (6) B with C, and (7) A with B and with C. As used herein in the
context of describing structures, components, items, objects and/or
things, the phrase "at least one of A and B" is intended to refer
to implementations including any of (1) at least one A, (2) at
least one B, and (3) at least one A and at least one B. Similarly,
as used herein in the context of describing structures, components,
items, objects and/or things, the phrase "at least one of A or B"
is intended to refer to implementations including any of (1) at
least one A, (2) at least one B, and (3) at least one A and at
least one B. As used herein in the context of describing the
performance or execution of processes, instructions, actions,
activities and/or steps, the phrase "at least one of A and B" is
intended to refer to implementations including any of (1) at least
one A, (2) at least one B, and (3) at least one A and at least one
B. Similarly, as used herein in the context of describing the
performance or execution of processes, instructions, actions,
activities and/or steps, the phrase "at least one of A or B" is
intended to refer to implementations including any of (1) at least
one A, (2) at least one B, and (3) at least one A and at least one
B.
The method 900 of FIG. 9 begins at block 902. At block 902, the
example component interface 802 receives load data from the first
load-sensing pin 105A and the second load-sensing pin 105B. For
example, the component interface 802 can receive data from the
first load-sensing pin 105A and/or the second load-sensing pin 105B
in an analog format (e.g., a voltage, etc.). In this example, the
component interface 802 converts the analog format into a digital
value (e.g., a force, a pressure, etc.).
At block 904, the hitch pin signal analyzer 804 determines the
vertical load condition of the hitch 101 based on data from the
first loading-sensing pin 105A and the second load-sensing pin
105B. For example, the hitch pin signal analyzer 804 can use the
example first vertical reactionary load 706 and the example second
vertical reactionary load 708 to determine the example applied
vertical load 704 using static equilibrium analysis techniques. For
example, the hitch pin signal analyzer 804 can utilize equation (1)
to determine the applied vertical load 704. In other examples, the
hitch pin signal analyzer 804 can use any other suitable means to
determine the vertical load condition.
At block 906, the example hitch pin signal analyzer 804 determines
the horizontal load condition of the hitch 101 based on data from
the second load-sensing pin 105B. In some examples, the hitch pin
signal analyzer 804 can use the first horizontal reactionary load
710 to determine the applied horizontal load 705 using static
equilibrium analysis techniques. For example, the hitch pin signal
analyzer 804 can utilize equation (2) to determine the applied
vertical load 704. In other examples, the hitch pin signal analyzer
804 can use any other suitable means to determine the horizontal
load condition.
At block 908, the example hitch pin signal analyzer 804 determines
the lateral load condition of the hitch 101 based on data from the
second load-sensing pin 105B. For example, the hitch pin signal
analyzer 804 can use the moment measured at the second load-sensing
pin 105B to determine the lateral load condition. In some examples,
the shape of the opening 204A prevents the first load-sensing pin
105A from bearing a reactionary moment, which enables the
calculation of the lateral loading condition. For example, the
hitch pin signal analyzer 804 can utilize equations (3) and/or (5)
to determine the applied vertical load 704.
At block 910, the example display alert generator 808 determines if
at least one of the horizontal load condition, the vertical load,
and the lateral load condition satisfies an alert threshold. If at
least one of the horizontal load condition, the vertical load, and
the lateral load condition satisfies the alert threshold, the
method 900 advances to block 912. If at least one of the horizontal
load condition, the vertical load, the lateral load condition does
not satisfy the alert threshold, the method 900 advances to block
914.
At block 912, the display alert generator 808 generates an alert.
For example, the display alert generator 808 can generate an audio
alert, a visual alert, etc. In some examples, the display alert
generator 808 can generate an alert including a description of the
load condition triggering the alert. In some examples, the display
alert generator 808 can generate an instruction indicating how to
correct the load condition.
At block 914, the display interface 810 displays the horizontal
load condition, the vertical load condition, lateral load condition
and/or the alert. For example, the display interface 810 can cause
the example display 114 to present the generated alert to a user of
the vehicle 100.
FIG. 10 is a block diagram of an example processor platform 1000
structured to execute the method 900 of FIG. 9 to implement the
load manager 102 of FIG. 8. The processor platform 1000 can be, for
example, a server, a personal computer, a workstation, a
self-learning machine (e.g., a neural network), a mobile device
(e.g., a cell phone, a smart phone, a tablet such as an iPad.TM.),
a personal digital assistant (PDA), an Internet appliance, a DVD
player, a CD player, a digital video recorder, a Blu-ray player, a
headset or other wearable device, or any other type of computing
device.
The processor platform 1000 of the illustrated example includes a
processor 1012. The processor 1012 of the illustrated example is
hardware. For example, the processor 1012 can be implemented by one
or more integrated circuits, logic circuits, microprocessors, GPUs,
DSPs, or controllers from any desired family or manufacturer. The
hardware processor may be a semiconductor based (e.g., silicon
based) device. In this example, the processor implements an example
component interface 802, an example hitch pin signal analyzer 804,
an example rear view camera data integrator 806, an example display
alert generator 808 and an example display interface 810.
The processor 1012 of the illustrated example includes a local
memory 1013 (e.g., a cache). The processor 1012 of the illustrated
example is in communication with a main memory including a volatile
memory 1014 and a non-volatile memory 1016 via a bus 1018. The
volatile memory 1014 may be implemented by Synchronous Dynamic
Random Access Memory (SDRAM), Dynamic Random Access Memory (DRAM),
RAMBUS.RTM. Dynamic Random Access Memory (RDRAM.RTM.) and/or any
other type of random access memory device. The non-volatile memory
1016 may be implemented by flash memory and/or any other desired
type of memory device. Access to the main memory 1014, 1016 is
controlled by a memory controller.
The processor platform 1000 of the illustrated example also
includes an interface circuit 1020. The interface circuit 1020 may
be implemented by any type of interface standard, such as an
Ethernet interface, a universal serial bus (USB), a Bluetooth.RTM.
interface, a near field communication (NFC) interface, and/or a PCI
express interface.
In the illustrated example, one or more input devices 1022 are
connected to the interface circuit 1020. The input device(s) 1022
permit(s) a user to enter data and/or commands into the processor
1012. The input device(s) can be implemented by, for example, an
audio sensor, a microphone, a camera (still or video), a keyboard,
a button, a mouse, a touchscreen, a track-pad, a trackball,
isopoint and/or a voice recognition system.
One or more output devices 1024 are also connected to the interface
circuit 1020 of the illustrated example. The output devices 1024
can be implemented, for example, by display devices (e.g., a light
emitting diode (LED), an organic light emitting diode (OLED), a
liquid crystal display (LCD), a cathode ray tube display (CRT), an
in-place switching (IPS) display, a touchscreen, etc.), a tactile
output device, a printer and/or speaker. The interface circuit 1020
of the illustrated example, thus, typically includes a graphics
driver card, a graphics driver chip and/or a graphics driver
processor.
The interface circuit 1020 of the illustrated example also includes
a communication device such as a transmitter, a receiver, a
transceiver, a modem, a residential gateway, a wireless access
point, and/or a network interface to facilitate exchange of data
with external machines (e.g., computing devices of any kind) via a
network 1026. The communication can be via, for example, an
Ethernet connection, a digital subscriber line (DSL) connection, a
telephone line connection, a coaxial cable system, a satellite
system, a line-of-site wireless system, a cellular telephone
system, etc.
The processor platform 1000 of the illustrated example also
includes one or more mass storage devices 1028 for storing software
and/or data. Examples of such mass storage devices 1028 include
floppy disk drives, hard drive disks, compact disk drives, Blu-ray
disk drives, redundant array of independent disks (RAID) systems,
and digital versatile disk (DVD) drives.
The machine executable instructions 1032 of FIG. 9 may be stored in
the mass storage device 1028, in the volatile memory 1014, in the
non-volatile memory 1016, and/or on a removable non-transitory
computer readable storage medium such as a CD or DVD.
Example 1 includes an apparatus to be coupled to a receiver tube,
apparatus comprising a crossbar interface to be coupled to a
crossbar of a hitch, a pin adapter coupled to the crossbar
interface, a first load-sensing pin disposed within the pin
adapter, and a second load-sensing pin disposed within the pin
adapter.
Example 2 includes the apparatus as defined in example 1, wherein
the pin adapter is to provide a first load path between the
receiver tube and the first load-sensing pin and a second load path
between the receiver tube and the second load-sensing pin.
Example 3 includes the apparatus as defined in example 1, wherein
the pin adapter is shaped such that the pin adapter does not
contact a horizontal surface of the first load-sensing pin.
Example 4 includes the apparatus as defined in example 1, wherein
the first load-sensing pin and the second load-sensing are at
substantially the same vertical position relative to the
crossbar.
Example 5 includes the apparatus as defined in example 1, further
including a load manager including a component interface to receive
load data from at least one of the first load-sensing pin and the
second load-sensing pin, a hitch pin signal analyzer to determine a
load condition of the housing based on the load data, and a display
interface to display the load condition.
Example 6 includes the apparatus as defined in example 5, wherein a
configuration of the first load-sensing pin and the second
load-sensing pin causes the load condition to be statically
determinate.
Example 7 includes the apparatus as defined in example 1, wherein
the first load-sensing pin and the second load-sensing pin provide
the only load path between the receiver tube and the crossbar.
Example 8 includes an apparatus, comprising a component interface
to receive load data from a first load-sensing pin and a second
load-sensing pin, the first load-sensing pin and the second
load-sensing pin operatively coupled to a receiver tube of a hitch
of a vehicle, a hitch pin signal analyzer to determine a load
condition of the hitch based on the load data, a display alert
generator to, when the load condition satisfies an alert threshold,
generate an alert, and a display interface to display at least one
of the load condition or the alert.
Example 9 includes the apparatus as defined in example 8, further
including a pin adapter to provide a load path between the first
and second load-sensing pins and the vehicle.
Example 10 includes the apparatus as defined in example 9, wherein
the pin adapter is shaped such that the pin adapter does not
contact a horizontal surface of the first load-sensing pin.
Example 11 includes the apparatus as defined in example 8, wherein
the hitch pin signal analyzer is further to determine a vertical
load condition of the hitch based on data from the first
load-sensing pin and the second load-sensing pin and determine a
horizontal load condition of the hitch based on data from the
second load-sensing pin.
Example 12 includes the apparatus as defined in example 9, wherein
the hitch pin signal analyzer determines the load condition based
on a configuration of the first load-sensing pin and the second
load-sensing pin, the configuration causing the load condition to
be statically determinate.
Example 13 includes the apparatus as defined in example 12, wherein
the configuration includes the first load-sensing pin and the
second load-sensing pin at substantially the same vertical position
relative to the receiver tube.
Example 14 includes the apparatus as defined in example 8, wherein
the alert threshold corresponds to an improper load condition.
Example 15 includes a method, comprising receiving load data from a
first load-sensing pin and a second load-sensing pin, the first
load-sensing pin and the second load-sensing pin are operatively
coupled to a receiver tube of a hitch of a vehicle, determining a
load condition of the hitch based on the load data, when the load
condition satisfies an alert threshold, generating an alert, and
presenting at least one of the load condition or the alert to a
user.
Example 16 includes the method as defined in example 15, wherein
the first load-sensing pin and the second load-sensing pin is
coupled to a pin adapter that is the only load path between the
first and second load-sensing pins and the receiver tube.
Example 17 includes the method as defined in example 16, wherein
the pin adapter is shaped such that the pin adapter does not
contact a horizontal surface of the first load-sensing pin.
Example 18 includes the method as defined in example 15, further
including determining a vertical load condition of the hitch based
on data from the first load-sensing pin and the second load-sensing
pin and determining a horizontal load condition of the hitch based
on data from the second load-sensing pin.
Example 19 includes the method as defined in example 15, wherein
the determination of the load condition is based on a configuration
of the first load-sensing pin and the second load-sensing pin, the
configuration causing the load condition to be statically
determinate.
Example 20 includes the method as defined in example 19, wherein
the configuration includes the first load-sensing pin and the
second load-sensing pin at substantially the same vertical position
relative to the receiver tube.
Although certain example methods, apparatus and articles of
manufacture have been disclosed herein, the scope of coverage of
this patent is not limited thereto. On the contrary, this patent
covers all methods, apparatus and articles of manufacture fairly
falling within the scope of the claims of this patent.
* * * * *